Typewriting machine



J. LINDBURG TYPEWRITING MACHINE Filed July 17 Oct. 19 1926.

Memisa oet. 1e, 1926.

Perser orties..

mener-i immense, or BeooirLYiv, New venir, nssenor To Uivnnnwoon TYPE-vferrna coi/Prima on new Yoeri, N. Y., .e oonr'onnrron or DELAWARE.

Application filed July 17, 1924. Serial No. 726,424.

This invention relates generallyto sounddeadening casings fortypewriting ma-` chinese, and more lparticularly to an adjustable springdevice cio-operating `with` the cover thereof to automatically open thesaine when access is desired to thetypewritler. A

' Unefeature of the invention is ithe provision ofmeans for'iobtainin'ga minute'adjustment ofthe spring tension of the device, so as toregulate the' action thereof to obtain the necessary ferce'forprperlyopening the cover, while at the sainev tinie'providing aycompactstructure of sufficient mechanical strength to transmit theaction of a heavy spring through the adjusting means and totheeover'withoutdanger of breaking or injuring the adjusting means. i'

` Another ffeat'ure'is the provision of means for gradually arrestingthe movement of the coverwhen' it is' approaching the open position,thus eliminating anypossibility of jar or vibration to the veasing'onthemachine contained therein. i i

" Other vfeatures and advantages will hereinafter appear.

In the accompanying drawings,

Figureiis a 'cross-section "through the sound-deadening casingshowingthe cover in closed position.- 'v

Figure 2 is a somewhat reduced viev7 similar to Figure 1, but showingthe cover opened.

Figure 3 is a plan view of one end of the casing, the cover being brokenaway to showl the cover-opening deviee. i

Figure'e'is an enlarged vertical section on the line 4 e of Figure 2.

The sound-deadening' casing comprises two main parts, namely, a housing10 and a rover 11, the cover being hinged at 12 to swing between thepositions indicated by Figures 1 and 2. Both the housing- 10 and therover 1 1 may beformed from sheet material and lined on their innerwalls with suitable sound-deadening material, such as that indicatedat`13v. The front wall 1-1 ofA the housing- 10` is cut awayv at 15 torallow 'the keybea'rd eitension of a A typewriting machine `(not shown)to" protrude there-v through" the upper portion of the machine extendingunder'the cover 11, asshown in dotanddash lines, at 16', window 17' the`cover 11 permits the work being typed in the in achinr-i to beobserved. Carriage-operating levers 18y extend through a slot 18 formedbetween the upper edge of the front wall 141 of the housing l0 and theforward edge 119 of the cover 11, theslot being practically closed bytwo resilient flexible cushions V2O andV 2'1`carried respectively by thecover and housing. l i

.For lockingthe cover in closed position7 there is pivoted at 22 to onevof the side walls of the cover a latch 23, vwhich extends" into thebody of the housing 10 and .is provided with a hooked end 211 which isspring pressed into engagement under a. lip or de-4 tent 25 fastened tothe-interior of the housiing. The latch may be disengaged from thedetent 25 by pressure upon" a fingerpieee 26, The* cover l11 is causedto automatically openl when the finger-piece 26 has releasedithe'latch,and for this purpose there is provided a spring device consisting of anarni-27 pivoted on'a` shaft 28', one end of the shaft being supported ina bracket 29 carried by the housing'i@ the other end of the lshaft?fitting within an aperture 30 in the end wall ofthe housing. i

The sound-deadening material 13 is cut out or slottedadjacent'thebracket 29 so as to permit the bracket to project therethrough. Thearm'27 has an elongated slot 31 therein, which provides side members andan end member 33. A roller 311 projects through the slot 31 and iscarried on a shouldered 'screw 35 threadedV into a boss 36 formed in theend Wall of the cover 11. A flat-headed screw 37 retains the roller 34in position upon the shouldered screw 35 and suihcient clearance isallowed to permit free rotation ef the roller; A pair of springs 3S and38 are oppositely disposed within the slot 31 of the arm 27', one endofeach spring;- being curved inwardly toward the opposite spring`r andthe other end of each 'spi-ine fastened within the side members 32 ofthe slot by meansof suitable bolts 39. The free ends of thesprings 38and' 33 are bent pas allelf with the main body portionA of' the springs,and forked as indicated' at 4:0. The forked ends of the springs 38 and33 tend from the slot on both sides thereofY and partiallyy around theend member Q ef the arm 27 to provide guide means for the 'free ends oitthe springs.

A worm-wheel 4l is mounted upon the shaft 28, and includes a hub portion42 projt g through a perforation 42 in the pivoted end et the arm 27,and provides a bearing upon which the arm may be moved anguiarly. Inbracket 29 is threaded a setscrew 44, the end of the screw tighteningagainst a fiat place 44 on the shaft 2S to secure the sameagainstrotation. A worm 45 meshing with the worm-wheel 4l is mounted intrunnions, which may be formed on the arm 27, as shown at 47. It will benoted that the worm is retained within the trunnions b y the worm-wheel4l, and is provined with a slot 48, so as to enable the worm to beturned by means ot a screwdniver in adjusting the device.

A heavy coil spring 49 encirclesthe shaft 2S, one end 50 of the springfitting into a perforation in the worm-wheel 4'1, the other end 5l ofthe spring engaging under the bracket 29, the action of the spring beingto raise the'cover when the cover is released by the latch 23. A washer52 may be provided between the arm 27 and the end wall of the housing10. It will be readily understood that when the worin is turned, theworm-wheel 41 winds up the spring 49 and by this means a very fineadjustment may be made to position the spring to the exact y' ing casingfor a typewriting machine includamount necessary to prevent opening thecover too violently. During the time that the cover is being opened bythe tension of the spring 49, the roller 34 bears directly against thespring 38 causing the roller to revolve, thus providing a smoothjandpractically :trietionless connection between the arm 27 and the cover1l.

It will be noted that the distance between the center of the hinge 12and the roller 84 is greater than the distance from the pivotal point ofthe arm 27 and said roller. It will also be noted that the pivotal pointof the arm 27 is somewhat below the line drawn through the center of thehinge 12 and the roller 84, so that when the arm 27 is actuated to movethe cover, the screw 35 carrying the roller 34 moves in the slot 8ltoward the free end of the arm until arrested by the curved port-ions ofthe springs 38 and 38', which cause the cover to be brought to rest inopen position, due to the wedging action of the roller between thesprings. During this operation, the cover has been smoothly moved fromthe position shown in Figure l and gradually brought to rest in theFigure 2 position without shock or vibration.

Variations may be resorted to within the scope of the invention, andportions of the improvements may be used without others.

Having thus described my invention, I claim: v

l. The combination with a sound-deadening casing for a typewritingmachine including a body, a cover hinged thereto, and releasable meansfor holding the cover closed, of a co'venopening device including an armpivoted to the body, a connection. from the pivoted to the body, aconnection from the cover to the arm and moving with relation theretowhen the cover is released to open, means for automatically swinging thearm around its pivot, and a pair of oppositelydisposed spring memberssecured to the arm and receiving the connection in slidable rclationthereto, said spring members being curved inwardly toward one another toprovide a wedging action upon said connection to gradually arrest themovement of the cover when thrown open by the action of the arm.

3. The combination with a sound-deadening a body, a cover hingedthereto, and releasable means for holding the cover closed, of acover-opening device including an arm pivoted to the body and having apin-andslot connection with the cover, means for automatically swingingthe arm around its pivot to open the cover when released, and meansassociated with said slot and efective to frictionally engage the pin tolimit the throw of the arm when opening the cover.

4. The combination with a sound-deadcn ring casing for a typewritingmachine includslot connection with the cover, means tor automaticallyswinging the arm around. its pivot to open the cover when released, andmeans associated with said slot and effectingl a wedging action againstthe pin to gradually arrest the movement of the cover when opening.

5. The combination with a sound-deadening casing for a typewritingmachine includv ing a body, a cover hinged thereto, and releasable meanstor holding the cover closed. of a cover-opening device including an armpivoted-to the body and having' a pin-and slot connection with thecover, means for automatically swingingthe arm around its pivot to openthe cover when released, and a lll) pair or' spring` members securedwithin the slot o'n opposite sides oi' the pin, the free ends or' saidspring members being curved inwardly toward each other and leffecting awedging action against the pin to gradually arrest movement oi' thecover when 'approaching open position.

6. The combination with a sound-deadening casing for a typewritingmachine including a body, a cover hinged thereto, and releasable meansfor holding the cover closed, of a cover-opening device including an armpivoted to the body, said arm having a slot therein, a roller carried bythe cover and moving in the slot, means tor automat-ically swinging thearm around its pivot to open said cover when released, and meansassociated with said slot and ei'lective to itrictionally engage saidroller to gradual` ly arrest the movement ot the cover when opening.

7. The combination with a sound-deadening casing tor a typewritingmachine including a body, a cover hinged thereto, and releasable meansfor holding the cover closed, ot a cover-opening device including an armpivoted to the body, said arm having a slot therein, a roller carried bythe cover and moving in the slot, means for automatically swinging thearm around its pivot to open said cover when released, and meansassociated with said slot to permit Ythe roller to have free rotationalmovement thereon during a portion of the opening oit the cover and thento frictionally engage said roller to gradually arrest the movement ofthe cover as the same approaches open po sition.

8. The combination with a sound-deadening casing for a typewritingmachine including a body, a cover hinged thereto, and releasable meansfor holding the cover closed, ot a cover-opening device including an armpivoted to the body, said arm having a slet therein, a roller carried bythe cover and moving in the slot, means for automatically swinging thearm around its pivot to open said cover when released, and a pair otoppositelydisposed spring members secured within the slot and engagingthe roller, the :tree ends of said spring members being curved inwardlytoward each other and effecting a wedging action to cause the roller togradually arrest the movement of the cover as it approaches openposit-ion.

9. The combination with a sound-deadening casing for a typewritino`machine includiug a body, a cover hinged thereto, and releasable meansJfor holding the cover closed, o'l a cover-opening device including anarm pivotedlto the body, a connection :trom the cover to the arm andmoving with relation thereto when the cover is released to open, meansfor automatically swinging the arm around its pivot, and a pair otoppositely-disposed spring men'ibers secured to the arm and receivingthe connection in Aslidable relation therewith, sai-l members beingcurved9 inwardly toward one vanother so as to cause said connection totorce the members apart to increase the rictional engagement betweensaid connection and mehr bers and thereby gradually arrest Inovement ofthe cover as the same approaches open posit-ion.

l0. rlhe combination with a sound-dead ening casing for a typewritingmachine having a body, a cover hinged thereto, and releasable means forholding the cover closed, of a cover-opening device including an armpivoted to the body and having a connection to the cover` resilientmeans :tor turning said arm around its pivot to open the cover whenreleased, and a worm-andwheel connection between the arm and theresilient means :tor varying the tension oi said resilient means toregulate the throw of the arm.

11. The combination with a sound-deadening casino' for a typewritingmachine having a body, a cover hinged thereto, and releasable means forholding the cover closed, of a cover-opening device including a shaftmounted in the body, an arm swingable around said shaft, a connectionbetween the arm and the cover, a worm-wheel se" cured to the shaft andmovable angularly with relation to the arm, a worm carried by the armand meshing with said wormwheel, and a coiled spring disposed around theshaft for opening the cover when released, one end of the springengaging the body and the other end carried in the wormwheel, so that,upon turning the worm, the

tension of said spring may be varied and the cover-opening effort oi thearm regulated.

l2. The combination with a sound-deadening casing Jfor a typewritinv'machine ini cluding a body, a cover hinged thereto, and releasable meansfor holding the cover closed, of a cover-opening device including an armpivoted to the body, a connection from the cover to the arm and movingwith relation thereto when the cover is released to open, resilientmeans for automatically swinging said arm around its pivot to impartmotion to the cover, means associated with said arm and connection forgradually arresting and then stopping the movement ot the cover as thesame nears its open position, and a worm-and-wheel connection betweenthe arm and the resilient means for varying the tension ot saidresilient means to regulate the throw ot the armg 13. The combinationwith a sound-death ening casing for a typewriting machine having a body,a cover hinged thereto, and releasable means for holding the coverclosed, of a cover-opening device including tension of said resilientmeans7 and means an arm pivoied to the body and having a associated Withthe slot and effective to pin-andslot connection With the cover, i'e-Cause an increasing frctional action against l0 silient means forcausing a tlnoW of the the pin to gradually rrest and then stop arm soas to impart movement to the cover, the movement of said cover as itapproaches a Worm-and-Wheel connection between the open position.

v arm and the resilient means for varying the JOSEPH LINDBU; l.

